Nginx域名www

下面给出如何在 nginx 里面实现上述的跳转：

# redirect http(s)://www.example.com to http(s)://example.comserver {    server_name www.example.com;    return 301 $scheme://example.com$request_uri;}# redirect http(s)://example.com to http(s)://www.example.comserver {    server_name example.com;    return 301 $scheme://www.$host$request_uri;}